Ned Kelly is on the run again, with thief who stole his bones

Infamous Australian bushranger Ned Kelly has authorities trying to track him down again - from beyond the grave.

They have discovered the skeletal remains of the notorious murderer have gone missing.

Heritage officials in Victoria say Kelly's skeletal remains have been removed from Melbourne's Pentridge Prison - but where they are now is something of a mystery.

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Kelly was hanged at the Old Melbourne Gaol in 1880 and his remains, together with those of other executed prisoners, were moved to Pentridge in the 1920s and 1930s and buried in a mass grave.

However, Heritage Victoria boss Ray Tonkin said: "We now believe these remains were probably removed in the 1950s or 1960s... as part of the installation of large service pipes that took place at the prison at the time."